The monsoon season in our country is during the months

Given below are statements about the harmful effects of weeds on crop plants.

(i) they interfere in harvesting.

(ii) they help crops plants to grow healthy.

(iii) they complete with crop plants for water, nutrients, space and light.

(iv) they affect plant growth.

Choose the correct combination of statements.

The process of loosening and turning of soil is called

The system of irrigation where in water is supplied drop by drop near the roots of plants is called

Pick out the odd one from the following words given in the box and give reason for it.

Plough, seed drill, hoe, chain pump, sickle